csharp-asteroids/ScreenObject.cs at master · unhuman/csharp-asteroids · GitHub

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using System;
using System.Collections;
using System.Drawing;
using Raylib_cs;
using RlColor = Raylib_cs.Color;

namespace Asteroids
{
   /// <summary>
   /// ScreenObject - defines an object to be displayed on screen
   /// This object is based on a cartesian coordinate system
   /// centered at 0, 0
   /// </summary>
   abstract class ScreenObject : CommonOps
   {
      // points is used for the internal cartesian system
      protected ArrayList points;
      public ArrayList pointsTransformed; // exposed to simplify explosions
      protected Point currLoc;
      protected double velocityX;
      protected double velocityY;
      protected double radians;

      public Point GetCurrLoc() {return currLoc;}
      public double GetVelocityX() {return velocityX;}
      public double GetVelocityY() {return velocityY;}
      public double GetRadians() {return radians;}

public ScreenObject(Point location)
{
         radians = 180 * Math.PI / 180;
         points = new ArrayList();
         points.Capacity = 20;
         pointsTransformed = new ArrayList();
         pointsTransformed.Capacity = 20;
         velocityX = 0;
         velocityY = 0;
         currLoc = location;

         InitPoints();
}

      public abstract void InitPoints();

      // Used to add points to a polygon
      public int AddPoint(Point pt)
      {
         points.Add(pt);
         return pointsTransformed.Add(pt);
      }

      protected void Rotate(double degrees)
      {
         double radiansAdjust = degrees * 0.0174532925;
         radians += radiansAdjust/FPS;
         double SinVal = Math.Sin(radians);
         double CosVal = Math.Cos(radians);

         pointsTransformed.Clear();
         Point ptTransformed = new Point(0,0);
         for (int i=0; i<points.Count; i++)
         {
            Point pt = ((Point)points[i]);
            ptTransformed.X = (int)(pt.X * CosVal + pt.Y * SinVal);
            ptTransformed.Y = (int)(pt.X * SinVal - pt.Y * CosVal);
            pointsTransformed.Add(ptTransformed);
         }
      }

      protected void DrawPolyToSC(ArrayList alPoly, ScreenCanvas sc, int iPictX, int iPictY,
                                   RlColor penColor)
      {
         Point[] ptsPoly = new Point[alPoly.Count];
         for (int i = 0; i<alPoly.Count; i++)
         {
            ptsPoly[i].X = (int)((currLoc.X + ((Point)alPoly[i]).X) / (double)iMaxX * iPictX);
            ptsPoly[i].Y = (int)((currLoc.Y + ((Point)alPoly[i]).Y) / (double)iMaxY * iPictY);
         }
         sc.AddPolygon(ptsPoly, penColor);
      }

      public virtual bool Move()
      {
         currLoc.X += (int)velocityX;
         currLoc.Y += (int)velocityY;
         if (currLoc.X < 0)
            currLoc.X = iMaxX-1;
         if (currLoc.X >= iMaxX)
            currLoc.X = 0;
         if (currLoc.Y < 0)
            currLoc.Y = iMaxY-1;
         if (currLoc.Y >= iMaxY)
            currLoc.Y = 0;

         return true;
      }

      protected RlColor GetRandomFireColor()
      {
         return rndGen.Next(3) switch
         {
            0 => RlColor.Red,
            1 => RlColor.Yellow,
            2 => RlColor.Orange,
            _ => RlColor.White,
         };
      }

      public virtual void Draw(ScreenCanvas sc, int iPictX, int iPictY)
      {
         DrawPolyToSC(pointsTransformed, sc, iPictX, iPictY, RlColor.White);
      }

      public virtual void Draw(ScreenCanvas sc, int iPictX, int iPictY, RlColor penColor)
      {
         DrawPolyToSC(pointsTransformed, sc, iPictX, iPictY, penColor);
      }
}
}